This Instructable shows how you may quickly convert camera or smartphone jpeg images of film negatives into quality positives. And, yes - it can be done in less than 5 seconds per negative once the conversion software is properly set up!
This Instructable assumes that you have already taken a digital picture of your negative using a smartphone or digital camera.
There are many ways to convert digital negatives to positives. The simplest way is to use the Invert command available in most photo editors; however this does not correct for the orange mask base color on color film negatives. After using the Invert command, there are various ways to manipulate the Red, Green, and Blue colors to obtain proper balance positive colors, but this can be a time-consuming process that requires some expertise to master. It is far easier and quicker to use VueScan to convert your digital negatives, and get near-perfect results in just a few seconds.
I have found that using a 3rd party software product called VueScan ($40) greatly simplifies the conversion process, although you may want to want to use a photo editing program after the conversion to touchup white balance and contrast. VueScan will convert both color and black-and-white digitized film negatives into quality positives.
The following steps show you how to use the VueScan software to convert your digitized film negatives into quality positives.
Disclaimer: I do not work for VueScan, nor am I affiliated with them in any way. I am simply sharing what I have found to be a simple and fast process to convert negatives.
Note: The three images above are: 1) Initial digitized film negative taken with a Canon Powershot SX110 IS, 2) the initial output from VueScan, and 3) the VueScan image, adjusted for white balance and contrast (touchup is not covered in this Instructable).